Tze-nan Wu 3ee4e2d09a tracing: Fix overflow in get_free_elt() ... commit bcf86c01ca4676316557dd482c8416ece8c2e143 upstream. "tracing_map->next_elt" in get_free_elt() is at risk of overflowing. Once it overflows, new elements can still be inserted into the tracing_map even though the maximum number of elements (`max_elts`) has been reached. Continuing to insert elements after the overflow could result in the tracing_map containing "tracing_map->max_size" elements, leaving no empty entries. If any attempt is made to insert an element into a full tracing_map using `__tracing_map_insert()`, it will cause an infinite loop with preemption disabled, leading to a CPU hang problem. Fix this by preventing any further increments to "tracing_map->next_elt" once it reaches "tracing_map->max_elt". Cc: stable@vger.kernel.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Fixes: 08d43a5fa063e ("tracing: Add lock-free tracing_map") Co-developed-by: Cheng-Jui Wang <cheng-jui.wang@mediatek.com> Link: https://lore.kernel.org/20240805055922.6277-1-Tze-nan.Wu@mediatek.com Signed-off-by: Cheng-Jui Wang <cheng-jui.wang@mediatek.com> Signed-off-by: Tze-nan Wu <Tze-nan.Wu@mediatek.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-11-23 23:20:29 +01:00
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blktrace.c
bpf_trace.c
bpf_trace.h
error_report-traces.c
fgraph.c
ftrace.c
ftrace_internal.h
ipc_logging.c
ipc_logging_debug.c
ipc_logging_private.h
Kconfig	tracing: Build event generation tests only as modules	2024-11-19 14:19:07 +01:00
kprobe_event_gen_test.c
Makefile
power-traces.c
preemptirq_delay_test.c	tracing: Add MODULE_DESCRIPTION() to preemptirq_delay_test	2024-11-19 14:19:29 +01:00
ring_buffer.c
ring_buffer_benchmark.c
rpm-traces.c
synth_event_gen_test.c
trace.c
trace.h
trace_benchmark.c
trace_benchmark.h
trace_boot.c
trace_branch.c
trace_clock.c
trace_dynevent.c
trace_dynevent.h
trace_entries.h
trace_event_perf.c
trace_events.c
trace_events_filter.c
trace_events_filter_test.h
trace_events_hist.c
trace_events_inject.c
trace_events_synth.c
trace_events_trigger.c
trace_export.c
trace_functions.c
trace_functions_graph.c
trace_hwlat.c
trace_irqsoff.c
trace_kdb.c
trace_kprobe.c	module: use RCU to synchronize find_module	2024-11-19 12:27:32 +01:00
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_mmiotrace.c
trace_nop.c
trace_output.c
trace_output.h
trace_preemptirq.c
trace_printk.c
trace_probe.c
trace_probe.h
trace_probe_tmpl.h
trace_readwrite.c
trace_sched_switch.c
trace_sched_wakeup.c
trace_selftest.c
trace_selftest_dynamic.c
trace_seq.c
trace_stack.c
trace_stat.c
trace_stat.h
trace_synth.h
trace_syscalls.c
trace_uprobe.c
tracing_map.c	tracing: Fix overflow in get_free_elt()	2024-11-23 23:20:29 +01:00
tracing_map.h